Cook rice, beans and potatoes for the week. You don't have to babysit it too much. Even throw in some veggies with the potatoes like broccoli, cauliflower, bell peppers, zucchini, asparagus, carrots, etc., and roast! Sometimes I make burger patties (or turkey or whatever ground meat) and eat those during the week. Simple salt and pepper. Salad mix with dressing is easy, even toss the roasted veggies on top for added nutrition. Get an avocado and toss that on for healthy fats.